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A synchronous motor on load draws a current at a leading power factor angle Φ. If the internal power angle ____ which is the phase angle between the excitation emf and the current in the phasor diagram is Ψ, then the air-gap excitation mmf lags behind the armature mmf. | |
A. | Ψ [Wrong Answer] |
B. | (π/2) + Ψ [Wrong Answer] |
C. | (π/2) - Ψ [Wrong Answer] |
D. | Ψ + Φ [Correct Answer] |